| English adjective: quintillionth | |||
| 1. | quintillionth the ordinal number of one quintillion in counting order | ||
| Similar | ordinal | ||
| Antonyms | cardinal | ||
| English noun: quintillionth | |||
| 1. | quintillionth (quantity) one part in a quintillion equal parts | ||
| Synonyms | one-quintillionth | ||
| Broader (hypernym) | common fraction, simple fraction | ||